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Method for constructing state space model of extra-high-voltage series MMC converter station

A technology of state space model and construction method, applied in the field of power transmission and distribution, can solve problems such as not considering the coupling relationship between the AC and DC side of the MMC converter, and having no solution

Inactive Publication Date: 2020-12-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] At present, there are many research results on the state space model of the MMC-based flexible DC system, but these studies mainly focus on a single MMC converter station, and do not consider the AC-DC side coupling of multiple MMC converters in the UHV flexible DC converter station. relationship, and this series structure will have a close AC-DC coupling relationship between the series MMC converters, which will fundamentally bring new features to the system dynamic model, so it is necessary to propose a method for UHV series MMC The state space model of , but there is no corresponding solution in the prior art

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  • Method for constructing state space model of extra-high-voltage series MMC converter station

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Embodiment Construction

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0016] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic diagram of the construction method of the state space model of the UHV series MMC converter station provided by the embodiment of the present invention, and the method includes:

[0017] Step 1. Based on a single MMC converter model, independently model the high and low end converters ...

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Abstract

The invention discloses a method for constructing a state space model of an extra-high-voltage series MMC converter station. The method comprises the steps of: independently modeling a high-end converter and a low-end converter of the extra-high-voltage series MMC converter station based on a single MMC converter model; correcting an established direct current model according to a series relationbetween the high-end converter and the low-end converter on the direct current side of the extra-high-voltage series MMC converter station; and establishing an interface of an alternating current system to the alternating current side of the high-end converter and the low-end converter according to a parallel relationship of the high-end converter and the low-end converter on the alternating current side of the extra-high-voltage series MMC converter station, and converting the related electrical quantities of the high-end and low-end converters on the alternating current side between different coordinate systems. The state space model constructed by utilizing the method considers the AC-DC side coupling relationship of multiple converters in the extra-high-voltage flexible DC converter station, and can accurately describe the dynamic characteristics of the extra-high-voltage series MMC high-low end converter.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method for constructing a state space model of an UHV series MMC converter station. Background technique [0002] With the development of HVDC projects in the direction of high voltage and large capacity, UHV flexible DC converter technology has also received extensive attention from academia and engineering circles. Unable to withstand UHV, two MMC converters need to be connected in series in order to match the voltage. [0003] At present, there are many research results on the state space model of the MMC-based flexible DC system, but these studies mainly focus on a single MMC converter station, and do not consider the AC-DC side coupling of multiple MMC converters in the UHV flexible DC converter station. relationship, and this series structure will have a close AC-DC coupling relationship between the series MMC converters, which will fundamenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M7/219
CPCH02J3/36H02M7/219H02J2203/20H02M1/0083Y02E60/60
Inventor 郭春义彭意郑安然赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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